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Nuclear Experiment

Title:Comparative studies of the interaction in the low energy ppeta and ppeta' systems

Abstract: The COSY-11 collaboration measured the pp -> ppeta and pp -> ppeta' reactions
in order to perform comparative studies of the interactions within the
proton-proton-meson system. This thesis presents in detail the analysis of the
pp -> ppeta' reaction which was measured at the proton beam momentum of 3.260
GeV/c. The elaboration results in differential distributions of squared
invariant proton-proton (s_pp) and proton-eta' (s_peta') masses, as well as in
angular distributions and the total cross section at an excess energy of 16.4
MeV. The differential distributions s_pp and s_peta' are compared to
theoretical predictions and to the analogous spectra determined for the pp ->
ppeta reaction. The comparison of the results for the eta and eta' meson
production rather excludes the hypothesis that the enhancement observed in the
invariant mass distributions is due to the meson-proton interaction. Further,
the shapes of the distributions do not favour any of the postulated theoretical
models.